These are settings I use for classic rock. The Presence and Treble should complement the other by having one to the lower setting if one is higher.

I once got a hold of some later amp settings for Jimmy Page and tweaked them a little for my setup. With the gain at about 11:00 it emulates his pick attack as a distortion controller and turning it to Noon is more like his early live sound. Turning the Treble to about 3:00 moves the mid scoop back in frequency and pushes the treble up to the kinds of brightness he liked. Lowering the Presence takes some bite out of the highs. The tube rectifier softens the distortion and compresses it nicely.

Alternate settings with increased FX Send. Added 12/26/15.

These settings are a lot like the kinds of sounds he got with the Supro on the first few albums. Sometimes I roll the bass back a little, but that is a matter of taste and boredom.

The updated example sounds really good for Good Times Bad Times, Dazed And Confused, Heartbreaker, and Living Loving Maid. The tube rectifier lends itself to emulating his sound, since the Supro also had one.